MURRYSVILLE, Pa. -- Pennsylvania Gov. Tom Corbett says there were a number of "heroes" who helped prevent further injury or loss of life during the high school hallway stabbing and slashing rampage and "many of them are students."

Murrysville Police Chief Thomas P. Seefeld says the first emergency call came in at 7:13 a.m. Wednesday and officers found a hallway "pretty much in chaos." He says there was lots of blood.

A 16-year-old boy accused of the knife rampage is appearing before a judge. He's expected to be charged as an adult.

Seefeld estimates the teenager was taken into custody within 5 minutes after the first emergency call. He says the crime scene is in one wing of the Murrysville high school, over a couple of hundred feet. He says the two weapons used were straight knives about 8 to 10 inches long.